/Engine/Source/Runtime/Engine/Classes/Engine/TextureLODSettings.h
Calculates and returns the LOD bias based on the information provided.
LOD bias
int32 CalculateLODBias ( int32 Width, int32 Height, int32 MaxSize, int32 LODGroup, int32 LODBias, int32 NumCinematicMipLevels, TextureMipGenSettings MipGenSetting, bool bVirtualTexture ) const